:root {
    color-scheme: light;
    --bg: #f4f7fb;
    --panel: #ffffff;
    --text: #182230;
    --muted: #687386;
    --primary: #176b87;
    --primary-dark: #0f536b;
    --line: #dce3ec;
    --success: #137a4d;
    --warning: #a85c00;
    --danger: #b42318;
    --info: #1f5ea8;
    --shadow: 0 16px 38px rgba(33, 54, 79, .10);
}

* { box-sizing: border-box; }
body {
    margin: 0;
    min-height: 100vh;
    background: radial-gradient(circle at 10% 0%, #e3f3f8 0, transparent 34%), var(--bg);
    color: var(--text);
    font-family: "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, sans-serif;
    line-height: 1.6;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
.container { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
    background: linear-gradient(120deg, #0e536c, #1781a2);
    color: #fff;
    padding: 28px 0;
    box-shadow: var(--shadow);
}
.site-header h1 { margin: 0; font-size: clamp(24px, 4vw, 38px); }
.site-header p { margin: 6px 0 0; opacity: .86; }
.main-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; padding: 28px 0 50px; }
.card {
    background: var(--panel);
    border: 1px solid rgba(220, 227, 236, .9);
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow);
}
.card.full { grid-column: 1 / -1; }
.card h2, .card h3 { margin-top: 0; }
.hint { color: var(--muted); font-size: 14px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-weight: 700; margin-bottom: 7px; }
.required::after { content: " *"; color: var(--danger); }
input, select, textarea {
    width: 100%;
    border: 1px solid #cdd7e3;
    border-radius: 9px;
    padding: 11px 12px;
    background: #fff;
    color: var(--text);
    font: inherit;
}
textarea { resize: vertical; min-height: 96px; }
select[multiple] { min-height: 180px; }
input:focus, select:focus, textarea:focus { outline: 3px solid rgba(23, 107, 135, .14); border-color: var(--primary); }
.button, button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    border: 0;
    border-radius: 9px;
    padding: 10px 17px;
    background: var(--primary);
    color: #fff;
    font: inherit;
    font-weight: 700;
    cursor: pointer;
}
.button:hover, button:hover { background: var(--primary-dark); text-decoration: none; }
.button.secondary, button.secondary { background: #e8eef5; color: #28384c; }
.button.danger, button.danger { background: var(--danger); }
.button.warning, button.warning { background: var(--warning); }
.button.small, button.small { padding: 6px 10px; font-size: 13px; }
.actions { display: flex; flex-wrap: wrap; gap: 9px; align-items: center; }
.alert { padding: 13px 16px; border-radius: 10px; margin: 18px 0; border: 1px solid transparent; }
.alert.success { background: #e8f7f0; color: #0f6841; border-color: #b9e4cf; }
.alert.warning { background: #fff5e7; color: #8a4b00; border-color: #f0d09f; }
.alert.error { background: #fff0ef; color: #97231b; border-color: #efc2bd; }
.alert.info { background: #edf5ff; color: #184d8a; border-color: #c7daf2; }
.badge { display: inline-block; border-radius: 999px; padding: 3px 9px; font-size: 12px; font-weight: 700; background: #edf1f5; color: #4c5969; }
.badge.success { background: #dcf5e9; color: var(--success); }
.badge.warning { background: #fff0d7; color: var(--warning); }
.badge.info { background: #e6f0ff; color: var(--info); }
.badge.muted { background: #edf1f5; color: var(--muted); }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 11px; }
table { width: 100%; border-collapse: collapse; background: #fff; }
th, td { padding: 11px 12px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; white-space: nowrap; }
th { background: #edf5f8; color: #174b5e; font-size: 14px; }
tr:last-child td { border-bottom: 0; }
.empty { padding: 30px; text-align: center; color: var(--muted); }
.profile-strip { display: flex; flex-wrap: wrap; gap: 18px; background: #f1f7fa; padding: 16px; border-radius: 11px; margin-bottom: 18px; }
.profile-strip strong { display: block; color: var(--muted); font-size: 12px; }
.admin-nav { background: #122b39; color: #fff; }
.admin-nav .container { display: flex; flex-wrap: wrap; align-items: center; gap: 4px; padding: 10px 0; }
.admin-nav a { color: #dceaf1; padding: 8px 11px; border-radius: 7px; }
.admin-nav a:hover, .admin-nav a.active { background: #1d5068; text-decoration: none; color: #fff; }
.admin-nav .spacer { flex: 1; }
.admin-main { padding: 24px 0 50px; }
.admin-title { display: flex; align-items: center; justify-content: space-between; gap: 15px; margin-bottom: 20px; }
.admin-title h1 { margin: 0; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-bottom: 22px; }
.stat { background: #fff; border: 1px solid var(--line); border-radius: 13px; padding: 18px; box-shadow: 0 8px 24px rgba(33,54,79,.07); }
.stat strong { display: block; font-size: 28px; color: var(--primary); }
.stat span { color: var(--muted); }
.two-columns { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.inline-form { display: inline-flex; gap: 7px; align-items: center; margin: 0; }
.inline-form input, .inline-form select { width: auto; min-width: 100px; }
.filters { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-bottom: 16px; }
.code { font-family: Consolas, Monaco, monospace; font-weight: 700; }
.login-shell { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-card { width: min(430px, 100%); }
.checkbox-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; max-height: 320px; overflow: auto; border: 1px solid var(--line); padding: 12px; border-radius: 9px; }
.checkbox-item { display: flex; align-items: center; gap: 8px; padding: 5px; }
.checkbox-item input { width: auto; }
.muted { color: var(--muted); }
.danger-text { color: var(--danger); }
details summary { cursor: pointer; color: var(--primary); font-weight: 700; }

@media (max-width: 900px) {
    .main-grid, .two-columns { grid-template-columns: 1fr; }
    .card.full { grid-column: auto; }
    .stats { grid-template-columns: repeat(2, 1fr); }
    .filters { grid-template-columns: 1fr 1fr; }
    .checkbox-list { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
    .container { width: min(100% - 20px, 1180px); }
    .card { padding: 18px; }
    .stats, .filters, .checkbox-list { grid-template-columns: 1fr; }
    .admin-title { align-items: flex-start; flex-direction: column; }
}